History Of The Capacitor – The Modern Era
The pioneering years in the history of capacitors was a time when capacitors were used primarily for gaining an early understanding of electricity, predating the discovery even of the electron. It was also a time for doing parlor demonstrations, such as having a line of people holding hands and discharging a capacitor through them. The modern era of capacitors begins in the late 1800s with the dawning of the age of the practical application of electricity, requiring reliable capacitors with specific properties.
One such practical use was in Marconi’s wireless spark-gap transmitters starting just before 1900 and into …read more
Hands-on the AND!XOR Unofficial DEF CON Badge
DEF CON 24 is still about two weeks away but we managed to get our hands on a hardware badge early. This is not the official hardware — there’s no way they’d let us leak that early. Although it may be unofficial in the sense that it won’t get you into the con, I’m declaring the AND!XOR badge to be officially awesome. I’ll walk you through it. There’s also a video below.
Over the past several years, building your own electronic badge has become an impromptu event. People who met at DEF CON and have been returning year after year …read more
What It’s Like to Quit Your Job and Start a Company – Then Fail
Some of our more dedicated readers may remember me as that promising and talented new writer who disappeared after only a couple of months last fall. Or, alternatively, that moronic new writer who had no idea what he was talking about. But, I’m just going to go ahead and assume it was the former in order to protect my ego. In either case, if you remember me at all, you may have wondered why I left. Was it cholera? Was I drafted into a top-secret CIA program? Did I join a circus as a fledgling trapeze artist?
No, it was …read more
VertiGo Robot Drives Up Walls
This collaboration between ETH and the Disney empire’s research arm is a ultra-light robot that can roll across horizontal surfaces and also transition and climb walls.
The robot has four wheels with one steerable set, but its secret sauce is the two propellers gimbaled on its back. Using these propellers it can move itself across the ground, but also, when approaching a wall, provide enough thrust to overcome the gravity vector.
Naturally, the lighter the robot, the less force will be needed to keep it on the wall. That’s why the frame is made from carbon fiber corrugated sandwich panels. …read more
It’s Not a Bridge, and Not a Tunnel. Or, Maybe it’s Both?
The gist of the idea is to suspend an underwater tunnel from floating pontoons. By the time you finished reading that sentence, you probably already had a list of things in your head that seem to make this a terrible idea. After all, it does seem to combine the worst aspects of both underwater tunnels and bridges. But, the idea may actually be a good one, and it’s already being seriously considered in Norway. …read more